Decorative plate for building energy saving and preparation method thereof

Abstract

The invention provides a decorative board for building energy conservation and a preparation method thereof. The decorative board comprises, by weight, 10 to 55 parts of white early-strength hydraulic cementitious material, 30 to 135 parts of carbonized active material, 13 to 73 parts of inert filler, 5 to 20 parts of potassium hexatitanate whiskers, 10 to 35 parts of ammonium bicarbonate, and 30 to 155 parts of water. The preparation method can quickly enhance the later strength of the decorative board by utilizing the characteristic that the carbonized active material absorbs carbon dioxide to generate calcium carbonate, and utilizes the excellent solar spectrum reflectivity and "atmospheric window" emissivity of calcium carbonate to improve the radiation cooling capacity of the decorative board, thereby reducing the heat load of the building, thereby reducing the cooling energy consumption of the building in summer, and further reducing the energy consumption of the building.

Description

Technical Field

[0001] The invention relates to the field of building materials, and in particular to a decorative plate for building energy saving and a preparation method thereof. Background Art

[0002] Building energy consumption accounts for more than 40% of total energy consumption. Building energy conservation has become an important way to reduce energy consumption and achieve carbon reduction. Building exterior wall decorative panels have become an important component of building exterior wall decoration materials. As the first barrier between the building and the external environment, the building energy-saving performance of building decorative panels will play a key role in reducing the overall building energy consumption. At present, most of the preparation materials of exterior wall decorative panels have the spectral characteristics of low solar radiation reflectivity and low "atmospheric window" emissivity, resulting in poor building energy conservation. They can only play the role of exterior wall decoration and protection, which is not conducive to reducing building energy consumption.

[0003] Therefore, there is an urgent need for a decorative plate for building energy conservation and a preparation method thereof to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a decorative plate for building energy conservation and a preparation method thereof, so as to improve the technical problem that the existing exterior wall decorative plates have poor building energy conservation performance.

[0005] In order to solve the above technical problems, the present invention provides a decorative board for building energy conservation, which includes, by weight: 10 to 55 parts of white early-strength hydraulic cementitious material, 30 to 135 parts of carbonization active material, 13 to 73 parts of inert filler, 5 to 20 parts of potassium hexatitanate whiskers, 10 to 35 parts of ammonium bicarbonate, and 30 to 155 parts of water.

[0006] In the decorative board for building energy conservation provided by the embodiment of the present invention, the white early-strength hydraulic cementitious material includes, by weight, 25 to 53 parts of calcium oxide, 26 to 41 parts of aluminum oxide, 5 to 12 parts of silicon dioxide, 0.2 to 13 parts of titanium dioxide, 5 to 15 parts of sulfur trioxide, and 1 to 4 parts of magnesium oxide; the specific surface area of ​​the white early-strength hydraulic cementitious material is in the range of 300 to 800 m 2 / kg.

[0007] In the decorative board for building energy conservation provided by the embodiment of the present invention, the carbonized active material includes at least one combination of dicalcium silicate, monocalcium silicate, dicalcium trisilicate and tricalcium silicate.

[0008] In the decorative board for building energy conservation provided by an embodiment of the present invention, the inert filler includes at least one combination of Al2O3, TiO2, ZrO2, ZnO, BaTiO3, BaSO4, MgTiO3, and SiO2; the particle size range of the inert filler is 100 to 1000 nm.

[0009] In the decorative plate for building energy conservation provided by the embodiment of the present invention, a plurality of protruding structures are arranged on the surface of the decorative plate, and the thickness of the decorative plate is in the range of 10 to 30 mm.

[0010] Accordingly, the present invention also provides a method for preparing a decorative plate for building energy saving as described above, the method comprising:

[0011] The white early-strength hydraulic cementitious material, the carbonization active material, the inert filler, the potassium hexatitanate whisker, the ammonium bicarbonate and the water are fully stirred to form a first slurry;

[0012] Pour the first slurry into the first mold and allow the first slurry to harden;

[0013] The hardened first slurry is placed in a carbon dioxide atmosphere for carbonization reaction to form a decorative plate.

[0014] In the method for preparing a decorative board for building energy conservation provided in an embodiment of the present invention, a first slurry is poured into a first mold and placed therein. In the step of hardening the first slurry, a silicone mold is also placed at the bottom of the first mold, and the silicone mold is molded by sandpaper.

[0015] In the method for preparing a decorative plate for building energy conservation provided by an embodiment of the present invention, after the step of pouring the first slurry into the first mold and placing the first slurry therein to harden the first slurry, the method further includes:

[0016] The first mold with the first slurry placed thereon is moved to a cool place for drying, so that the moisture content of the first slurry is 20% to 35%.

[0017] In the method for preparing a decorative board for building energy conservation provided by an embodiment of the present invention, the step of placing the hardened first slurry in a carbon dioxide atmosphere for carbonization reaction to form the decorative board further includes:

[0018] The hardened first slurry is placed in a carbonization tank with a volume concentration of carbon dioxide of 10 to 99% and a partial pressure of carbon dioxide of 0.05 to 0.5 MPa.

[0019] In the method for preparing a decorative plate for building energy conservation provided by an embodiment of the present invention, the hardening treatment time of the first slurry is 24 to 48 hours, and the carbonization reaction time of the first slurry is 24 to 48 hours.

[0020] The beneficial effects of the present invention are as follows: Different from the prior art, the present invention provides a decorative board for building energy conservation and a preparation method thereof, wherein the decorative board comprises, by weight, 10 to 55 parts of white early-strength hydraulic cementitious material, 30 to 135 parts of carbonized active material, 13 to 73 parts of inert filler, 5 to 20 parts of potassium hexatitanate whiskers, 10 to 35 parts of ammonium bicarbonate, and 30 to 155 parts of water; the preparation method can quickly enhance the later strength of the decorative board by utilizing the characteristic that the carbonized active material absorbs carbon dioxide to produce calcium carbonate, and utilizes the excellent solar spectrum reflectivity and "atmospheric window" emissivity of calcium carbonate to improve the radiation cooling ability of the decorative board, thereby reducing the heat load of the building, thereby reducing the cooling energy consumption of the building in summer, and further reducing the energy consumption of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow chart of a method for preparing a decorative plate for building energy conservation provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The invention provides a decorative board for building energy conservation and a preparation method thereof. The decorative board comprises, by weight, 10 to 55 parts of white early-strength hydraulic cementitious material, 30 to 135 parts of carbonized active material, 13 to 73 parts of inert filler, 5 to 20 parts of potassium hexatitanate whiskers, 10 to 35 parts of ammonium bicarbonate, and 30 to 155 parts of water. The preparation method can quickly enhance the later strength of the decorative board by utilizing the characteristic that the carbonized active material absorbs carbon dioxide to generate calcium carbonate, and utilizes the excellent solar spectrum reflectivity and "atmospheric window" emissivity of calcium carbonate to improve the radiation cooling ability of the decorative board, thereby reducing the heat load of the building, thereby reducing the cooling energy consumption of the building in summer, and further reducing the energy consumption of the building.

[0024] The technical solution of the present application is now described in conjunction with specific embodiments.

[0025] The invention provides a decorative board for building energy conservation. The decorative board comprises, by weight, 10 to 55 parts of white early-strength hydraulic cementitious material, 30 to 135 parts of carbonization active material, 13 to 73 parts of inert filler, 5 to 20 parts of potassium hexatitanate whisker, 10 to 35 parts of ammonium bicarbonate and 30 to 155 parts of water.

[0026] In the decorative board for building energy conservation provided by the embodiment of the present invention, the white early-strength hydraulic cementitious material includes, by weight, 25 to 53 parts of calcium oxide, 26 to 41 parts of aluminum oxide, 5 to 12 parts of silicon dioxide, 0.2 to 13 parts of titanium dioxide, 5 to 15 parts of sulfur trioxide, and 1 to 4 parts of magnesium oxide; the specific surface area of ​​the white early-strength hydraulic cementitious material is in the range of 300 to 800 m 2 / kg.

[0027] Specifically, the above decorative board can provide early strength for the decorative board through the specially prepared white early-strength hydraulic cementitious material, and the white early-strength hydraulic cementitious material has a high solar reflectivity and will not affect the efficiency of radiant cooling;

[0028] Among them, the radiation cooling technology uses 3K space as a cold source to reduce the absorption of solar energy during the day, so as to achieve radiation cooling without consuming energy. It is suitable for the decorative and protective role of building exterior walls or outdoor equipment in areas with hot and dry summers.

[0029] In an embodiment of the present invention, the carbonized active material includes at least one combination of dicalcium silicate, monocalcium silicate, dicalcium trisilicate and tricalcium silicate.

[0030] Specifically, the carbonized active material can absorb CO2 to produce calcium carbonate, quickly enhance the later strength of the energy-saving decorative board, and utilize the excellent solar spectrum reflectivity and "atmospheric window" emissivity of calcium carbonate to improve its radiation cooling ability. Among them, electromagnetic waves are less reflected, absorbed and scattered when passing through the atmosphere, and those bands with high transmittance are called atmospheric windows.

[0031] In an embodiment of the present invention, the inert filler includes at least one combination of Al2O3, TiO2, ZrO2, ZnO, BaTiO3, BaSO4, MgTiO3, and SiO2; and the particle size of the inert filler ranges from 100 to 1000 nm.

[0032] Specifically, the inert filler can improve the reflectivity of the solar spectrum of the overall decorative building material and reduce the absorption of solar energy.

[0033] In an embodiment of the present invention, the above-mentioned decorative building materials can achieve microscopic structural toughening by adding potassium hexatitanate whiskers with excellent thermal insulation properties and low solar radiation absorption rate; wherein the whiskers are micro-nanoscale short fibers grown from high-purity single crystals, and their mechanical strength is equal to the strength generated by the forces between adjacent atoms.

[0034] In the embodiment of the present invention, the bicarbonate ions in the ammonium bicarbonate react chemically with the carbonized white early-strength hydraulic cementitious material to produce calcium carbonate, and the ammonium ions decompose to produce ammonia. Therefore, by adding ammonium bicarbonate to the above-mentioned decorative building materials, the carbonization process and microscopic pore structure of the decorative building materials can be further optimized, thereby ensuring the long-term durability of the radiant cooling performance.

[0035] In the embodiment of the present invention, a plurality of protrusion structures (micro-protrusions on the surface) are arranged on the surface of the decorative plate, and the thickness of the decorative plate ranges from 10 to 30 mm; wherein the protrusion structures can realize the hydrophobic self-cleaning function of the decorative plate.

[0036] Accordingly, see Figure 1 The present invention also provides a method for preparing a decorative plate for building energy conservation as described above, the method comprising:

[0037] S10, fully and uniformly mixing the white early-strength hydraulic cementitious material, the carbonization active material, the inert filler, the potassium hexatitanate whisker, the ammonium bicarbonate and the water to form a first slurry.

[0038] Specifically, S10 also includes:

[0039] The white early-strength hydraulic cementitious material, the carbonization active material, the inert filler and the ammonium bicarbonate powder are uniformly mixed, and then water in which the ammonium bicarbonate is dissolved is added and the mixture is fully stirred to form a uniform first slurry.

[0040] S20, pouring the first slurry into the first mold and placing it therein to allow the first slurry to harden.

[0041] Specifically, S20 also includes:

[0042] The prepared first slurry is poured into the first mold and placed for 24 to 48 hours to allow the first slurry to harden; wherein, a silicone mold made by molding with 800 to 1600 mesh sandpaper is placed at the bottom of the first mold required for casting to form surface micro-protrusions to achieve hydrophobic self-cleaning function.

[0043] S30, placing the hardened first slurry in a carbon dioxide atmosphere for carbonization reaction to form a decorative plate.

[0044] Specifically, S30 also includes:

[0045] First, the first mold containing the first slurry is moved to a cool place for drying, so that the moisture content of the first slurry is 20% to 35%;

[0046] Afterwards, the first mold is removed, and the hardened first slurry is placed in a carbon dioxide atmosphere for carbonization reaction, and a decorative board is formed after 24 to 48 hours; specifically, the hardened first slurry is placed in a carbonization tank with a volume concentration of carbon dioxide of 10 to 99%, and a partial pressure of carbon dioxide of 0.05 to 0.5 MPa.

[0047] The preparation method of the decorative plate for building energy conservation provided by the present invention uses the reverse molding method during injection molding to give the decorative plate a hydrophobic and self-cleaning ability, and can keep the surface of the decorative plate clean for a long time.

[0048] Air conditioning and refrigeration in summer account for a large proportion of building energy consumption. Radiant cooling technology, as an emerging passive cooling technology, has been proven in many studies to be well used in building energy conservation. The present invention aims to manufacture a building energy-saving decorative plate by using a casting method, so as to give the future "green building" a layer of energy-saving "coat".

[0049] The following examples 1 to 4 are used to analyze and explain the implementation effects of the aforementioned decorative panels for building energy conservation.

[0050] Embodiment 1:

[0051] The composition of Example 1 in terms of mass fractions is 30 parts of white early-strength hydraulic cementitious material, 100 parts of carbonization active material, 35 parts of inert filler, 15 parts of potassium hexatitanate whisker, 20 parts of ammonium bicarbonate, and 94 parts of water.

[0052] Among them, the composition of the white early-strength hydraulic cementitious material in terms of mass parts is: 35 parts of CaO, 37 parts of Al2O3, 8 parts of SiO2, 4 parts of TiO2, 10 parts of SO3, and 1 part of MgO.

[0053] The carbonization active material is a combination of dicalcium silicate and monocalcium silicate in a ratio of 1:1.

[0054] The inert filler is a combination of Al2O3 and ZrO2 in a ratio of 2:1.

[0055] The mold sandpaper is 800 mesh and the board thickness is 10mm.

[0056] In the carbonization tank with a CO2 concentration of 99%, the CO2 partial pressure is 0.1MPa and the carbonization time is 24h.

[0057] Embodiment 2:

[0058] The composition of Example 2 in terms of mass fractions is 30 parts of white early-strength hydraulic cementitious material, 100 parts of carbonization active material, 35 parts of inert filler, 5 parts of potassium hexatitanate whisker, 20 parts of ammonium bicarbonate, and 94 parts of water.

[0059] Among them, the composition of the white early-strength hydraulic cementitious material in terms of mass parts is: 35 parts of CaO, 37 parts of Al2O3, 8 parts of SiO2, 4 parts of TiO2, 10 parts of SO3, and 1 part of MgO.

[0060] The carbonization active material is a combination of dicalcium silicate and monocalcium silicate in a ratio of 1:1.

[0061] The inert filler is a combination of Al2O3 and ZrO2 in a ratio of 2:1.

[0062] The mold sandpaper is 800 mesh and the board thickness is 10mm.

[0063] In the carbonization tank with a CO2 concentration of 99%, the CO2 partial pressure is 0.1MPa and the carbonization time is 24h.

[0064] Embodiment 3:

[0065] The composition of Example 3 in terms of mass fractions is 40 parts of white early-strength hydraulic cementitious material, 130 parts of carbonization active material, 50 parts of inert filler, 15 parts of potassium hexatitanate whisker, 25 parts of ammonium bicarbonate, and 85 parts of water.

[0066] Among them, the composition of the white early-strength hydraulic cementitious material in terms of mass parts is: 40 parts of CaO, 37 parts of Al2O3, 8 parts of SiO2, 8 parts of TiO2, 10 parts of SO3, and 1 part of MgO.

[0067] The carbonization active material is a combination of dicalcium silicate and monocalcium silicate in a ratio of 1:1.

[0068] The inert filler is a combination of Al2O3 and ZrO2 in a ratio of 2:1.

[0069] The mold sandpaper is 800 mesh and the board thickness is 10mm.

[0070] In the carbonization tank with a CO2 concentration of 99%, the CO2 partial pressure is 0.1MPa and the carbonization time is 24h.

[0071] Embodiment 4:

[0072] The composition of Example 4 in terms of mass fractions is 40 parts of white early-strength hydraulic cementitious material, 130 parts of carbonization active material, 20 parts of inert filler, 15 parts of potassium hexatitanate whisker, 25 parts of ammonium bicarbonate, and 85 parts of water.

[0073] Among them, the composition of the white early-strength hydraulic cementitious material in terms of mass parts is: 40 parts of CaO, 37 parts of Al2O3, 8 parts of SiO2, 8 parts of TiO2, 10 parts of SO3, and 1 part of MgO.

[0074] The carbonized active material is a combination of dicalcium silicate and monocalcium silicate in a ratio of 2:1.

[0075] The inert filler is a combination of Al2O3 and TiO2 in a ratio of 2:1.

[0076] The mold sandpaper is 1200 mesh and the board thickness is 10mm.

[0077] In the carbonization tank with a CO2 concentration of 99%, the CO2 partial pressure is 0.1MPa and the carbonization time is 24h.

[0078] In the above embodiments, the curing was carried out under the corresponding CO2 conditions in the same indoor environment according to the corresponding curing system. The cured products were subjected to a radiation cooling experiment at noon on a sunny day, and their solar spectrum reflectivity and "atmospheric window" emissivity were tested. The experimental results are shown in Table 1 below:

[0079]

[0080] Table 1

[0081] As can be seen from Table 1, Examples 1 to 4 of the present invention all have very high solar spectrum reflectivity (the reflectivity for light in the wavelength range of 0.2 to 2.5 μm is above 93.2%) and very high "atmospheric window" emissivity (the emissivity for light in the wavelength range of 8 to 13 μm is above 96.4%), and can achieve a cooling effect of up to -8 degrees Celsius on the building at noon, thereby having a very good building energy-saving effect.

[0082] Furthermore, by comparing Example 1 of the present invention with Example 2 of the present invention, it can be seen that when the content of potassium hexatitanate whiskers in the decorative building material is increased, the emissivity and flexural strength of the "atmospheric window" of the decorative building material can be effectively improved.

[0083] The present invention discloses a building energy-saving decorative plate and a preparation method thereof. The building energy-saving decorative plate uses a material with carbonization activity as the main body, optimizes the composition ratio by adding white pigment fillers and inert fillers with high refractive index, improves the microstructure, uses a casting method to form, and utilizes its chemical reaction with carbon dioxide to form an outdoor decorative plate with high compressive strength and high durability. The high solar radiation reflectivity and the spectral characteristics of the high "atmospheric window" emissivity of the plate are utilized to realize the radiation cooling function, reduce the heat load of the building body, reduce the cooling energy consumption of the building in summer, and have the function of decorating and protecting the exterior wall of the building. At the same time, the building energy-saving decorative plate can also be used to protect outdoor equipment and reduce the damage to outdoor equipment caused by high temperature.

[0084] In summary, different from the prior art, the present invention has the following beneficial effects:

[0085] In the first aspect, the present invention provides a decorative board with building energy saving and a preparation method thereof, which has a simple preparation process and absorbs carbon dioxide during the production process, and is a low-carbon and environmentally friendly green building material;

[0086] Secondly, the decorative board produced by the present invention has a radiant cooling function, which can effectively reduce the heat load of the building and achieve building energy saving;

[0087] Thirdly, the decorative board produced by the present invention has a hydrophobic self-cleaning effect, can keep the surface clean for a long time, and ensure the maintenance of the radiation cooling effect;

[0088] Fourthly, the energy-saving building decorative board produced by the present invention adopts pure inorganic materials and has excellent UV resistance and durability, thereby ensuring its long-term structural stability and long-term functional effectiveness.

[0089] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference may be made to the description in other embodiments.

[0090] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A decorative plate for building energy saving, characterized in that: The decorative board comprises, by weight, 10 to 55 parts of white early-strength hydraulic cementitious material, 30 to 135 parts of carbonized active material, 13 to 73 parts of inert filler, 5 to 20 parts of potassium hexatitanate whisker, 10 to 35 parts of ammonium bicarbonate, and 30 to 155 parts of water. The surface of the decorative board is provided with a plurality of protruding structures. The thickness of the decorative board is in the range of 10 to 30 mm. The white early-strength hydraulic cementitious material comprises, by weight, 25 to 53 parts of calcium oxide, 26 to 41 parts of aluminum oxide, 5 to 12 parts of silicon dioxide, 0.2 to 13 parts of titanium dioxide, 5 to 15 parts of sulfur trioxide, and 1 to 4 parts of magnesium oxide. The specific surface area of ​​the white early-strength hydraulic cementitious material is in the range of 300 to 800 m 2 / kg, the carbonized active material includes at least one combination of dicalcium silicate, monocalcium silicate, dicalcium trisilicate and tricalcium silicate.

2. The decorative plate for building energy saving according to claim 1, characterized in that: The inert filler includes at least one combination of Al2O3, TiO2, ZrO2, ZnO, BaTiO3, BaSO4, MgTiO3, and SiO2; the particle size of the inert filler ranges from 100 to 1000 nm.

3. A method for preparing a decorative plate for building energy saving according to any one of claims 1 to 2, characterized in that: The method comprises: The white early-strength hydraulic cementitious material, the carbonization active material, the inert filler, the potassium hexatitanate whisker, the ammonium bicarbonate and the water are fully stirred to form a first slurry; Pour the first slurry into a first mold and allow the first slurry to harden; The hardened first slurry is placed in a carbon dioxide atmosphere for carbonization reaction to form the decorative board.

4. The method for preparing a decorative plate for building energy saving according to claim 3, characterized in that: In the step of pouring the first slurry into the first mold and placing it therein to harden the first slurry, a silicone mold is also placed at the bottom of the first mold, and the silicone mold is molded by sandpaper.

5. The method for preparing a decorative plate for building energy saving according to claim 3, characterized in that: After the step of pouring the first slurry into the first mold and placing the first slurry therein to harden, the method further comprises: The first mold with the first slurry placed thereon is moved to a cool place for drying, so that the moisture content of the first slurry is 20% to 35%.

6. The method for preparing a decorative plate for building energy saving according to claim 5, characterized in that: The step of placing the hardened first slurry in a carbon dioxide atmosphere for carbonization reaction to form the decorative board further includes: The hardened first slurry is placed in a carbonization tank with a volume concentration of carbon dioxide of 10-99% and a partial pressure of carbon dioxide of 0.05-0.5 MPa.

7. The method for preparing a decorative plate for building energy saving according to claim 3, characterized in that: The hardening treatment time of the first slurry is 24 to 48 hours, and the carbonization reaction time of the first slurry is 24 to 48 hours.

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